Deep Sky Object in Winter
Around Sh2-227, 228 (Diffused Nebulae in Auriga)
Click on image to enlarge
| Date & Time: | Dec 24 2022, from 25:31 to 27:369 JST(+0900) |
| Mosaic of 2 flames of 8min.×6shots |
| Optical: | TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3) |
| with IDAS LPS-D1 Light-pollution suppression filter |
| Auto-guided with TAKAHASHI JP Equatorial+SBIG STV |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -25°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording format...16bit FITS, converted to 16bit TIFF(6248×4176) |
| Device Size...23.5×15.7mm, Gain...100 |
| Sh2-227 / Diffused Nebula, type 5 R |
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| R.A. | 05h 19m 51.0s (2000.0) |
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| Dec. | +38° 55' 00" (2000.0) |
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| Apparent Size | 22.5' |
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| Real Size | 80 light yrs. |
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| Magnitude | - |
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| Distance | 14,000 light yrs. |
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| Other IDs | LBN 781 |
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| NGC1857 / Open Cluster, type I 3 m |
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| R.A. | 05h 20m 06.0s (2000.0) |
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| Dec. | +39° 20' 36" (2000.0) |
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| Apparent Size | 5.0' |
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| Real Size | N/A |
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| # of Stars | 40 |
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| Magnitude | 7.0“™ |
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| Distance | N/A |
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This image captures the faint Hα nebulae and open star clusters scattered around μAur, which is located 7.5 degrees south of Capella in the pentagon of Auriga.
Sh2-227 is a nebula with an apparent diameter of over 20 arc minutes in the upper left.
It is almost circular, and you can see that there is unevenness inside.
You can see a small open cluster of NGC1857 in 0.5 degrees north of the nebula, about 40 member stars have been gathered in 5 arc minutes in diameter.
The cluster looks unexpectedly striking because of its high star density.
Small red nebulae are located in the lower right of the field. Sh2-226 is 2 arc minutes in size, and Sh2-228, which is visible 45 arc minutes southeast of it,
is the most photographable of these nebulae and has an extension of about 8 arc minutes.
A little reddish nebula less than 1 degree to the east is IC2120, which is about 1 minute in size.
Although the detailed structure is not clear in this picture, it has been classified as a planetary nebula.
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| Sh2-226 / Diffused Nebula, type 3 E |
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| R.A. | 05h 11m 06.7s (2000.0) |
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| Dec. | +37°59' 33" (2000.0) |
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| Apparent Size | 2.0' |
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| Real Size | 8 light yrs. |
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| Magnitude | - |
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| Distance | 13700 light yrs. |
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| Other IDs | LBN 780 |
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| Sh2-228 / Diffused Nebula, type 1 E |
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| R.A. | 05h 13m 35.0s (2000.0) |
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| Dec. | +37°27' 11" (2000.0) |
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| Apparent Size | 8.0' |
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| Real Size | 26 light yrs. |
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| Magnitude | - |
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| Distance | 11400 light yrs. |
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| Other IDs | LBN 783 |
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| IC2120 / Planetary Nebula, |
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| R.A. | 05h 18m 10.4s (2000.0) |
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| Dec. | +37°33' 28" (2000.0) |
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| Apparent Size | 60.0" |
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| Real Size | 1.2 light yrs. |
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| Magnitude | - |
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| Distance | 4160 light yrs. |
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| Other IDs | PK 169-0.1 |
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Nebulae & Star clusters around Sh2-227, 228
Italic indicates ID of open clusters |
